M+S or Winter tires required in western U.S.?
I did a search of DOT websites. It appears M+S or winter (mountain-snowflake marked) tires are not required in WA, ID, MT, UT, CA, NV, AZ unless conditions warrant authorities to require them i.e....
Forum Discussion
A friend was towing in California during the winter time. There was no snow on the ground. However, he wanted to visit one of the National Parks. Snow chains were required to be available. He had to double back 30miles to buy snow chains despite no snow on the ground.
